Insulin is a pancreatic hormone that reduces the concentration of glucose in the blood. There are two reasons for administering insulin:
insulin is not produced by cells in the pancreas (type 1 diabetes)
cells and tissues do not "respond" to the amount of insulin produced in the body (type 2 diabetes).
Thus, insulin must be injected to maintain normal blood glucose levels, as its excessive amount damages organs and tissues (primarily the vessels that supply blood to all organs and tissues).
Insulin is administered to patients with diabetes mellitus. When either the pancreas does not produce enough insulin (type 1 diabetes), or organs and tissues do not respond properly (type 2 diabetes)
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